Buggy code:
public class VAJAntToolGUI extends Frame { private static final String lineSeparator = "\r\n" ; private VAJAntToolGUI . VAJBuildLogger logger = new VAJAntToolGUI . VAJBuildLogger ( ) ; private VAJAntToolGUI . PrivateEventHandler iEventHandler = new VAJAntToolGUI . PrivateEventHandler ( ) ; private VAJBuildInfo iBuildInfo = null ; private MenuBar iAntMakeMenuBar = null ; private Menu iFileMenu = null ; private MenuItem iSaveMenuItem = null ; private MenuItem iMenuSeparator = null ; private MenuItem iShowLogMenuItem = null ; private Menu iHelpMenu = null ; private MenuItem iAboutMenuItem = null ; private Panel iContentsPane = null ; private Panel iOptionenPanel = null ; private Panel iCommandButtonPanel = null ; private FlowLayout iCommandButtonPanelFlowLayout = null ; private Label iProjectLabel = null ; private Label iProjectText = null ; private Label iBuildFileLabel = null ; private TextField iBuildFileTextField = null ; private boolean iConnPtoP2Aligning = false ; private Button iBrowseButton = null ; private FileDialog iFileDialog = null ; private Choice iMessageOutputLevelChoice = null ; private Label iMessageOutputLevelLabel = null ; private Label iTargetLabel = null ; private List iTargetList = null ; private Button iBuildButton = null ; private Button iReloadButton = null ; private Button iCloseButton = null ; private Frame iMessageFrame = null ; private Panel iMessageCommandPanel = null ; private Panel iMessageContentPanel = null ; private TextArea iMessageTextArea = null ; private Button iMessageOkButton = null ; private Button iMessageClearLogButton = null ; private Dialog iAboutDialog = null ; private Panel iAboutDialogContentPanel = null ; private Panel iAboutInfoPanel = null ; private Panel iAboutCommandPanel = null ; private Label iAboutTitleLabel = null ; private Label iAboutDevLabel = null ; private Label iAboutContactLabel = null ; private Button iAboutOkButton = null ; private Button iStopButton = null ; public VAJAntToolGUI ( VAJBuildInfo newBuildInfo ) { } private VAJAntToolGUI ( ) { } public static void centerDialog ( Dialog dialog ) { } public static String formatTime ( long millis ) { } private void setBuildInfo ( VAJBuildInfo newValue ) { } private Panel getAboutCommandPanel ( ) { } private Label getAboutContactLabel ( ) { } private Label getAboutDevLabel ( ) { } private Dialog getAboutDialog ( ) { } private Panel getAboutDialogContentPanel ( ) { } private Panel getAboutInfoPanel ( ) { } private MenuItem getAboutMenuItem ( ) { } private Button getAboutOkButton ( ) { } private Label getAboutTitleLabel ( ) { } private MenuBar getAntMakeMenuBar ( ) { } private Button getBrowseButton ( ) { } private Button getBuildButton ( ) { } private Label getBuildFileLabel ( ) { } private TextField getBuildFileTextField ( ) { } private VAJBuildInfo getBuildInfo ( ) { } private Button getCloseButton ( ) { } private Panel getCommandButtonPanel ( ) { } private FlowLayout getCommandButtonPanelFlowLayout ( ) { } private Panel getContentsPane ( ) { } private FileDialog getFileDialog ( ) { } private Menu getFileMenu ( ) { } private Menu getHelpMenu ( ) { } private MenuItem getMenuSeparator ( ) { } private Button getMessageClearLogButton ( ) { } private Panel getMessageCommandPanel ( ) { } private Panel getMessageContentPanel ( ) { } private Frame getMessageFrame ( ) { } private Button getMessageOkButton ( ) { } private Choice getMessageOutputLevelChoice ( ) { } private Label getMessageOutputLevelLabel ( ) { } private TextArea getMessageTextArea ( ) { } private Panel getOptionenPanel ( ) { } private Label getProjectLabel ( ) { } private Label getProjectText ( ) { } private Button getReloadButton ( ) { } private MenuItem getSaveMenuItem ( ) { } private MenuItem getShowLogMenuItem ( ) { } private Button getStopButton ( ) { } private Label getTargetLabel ( ) { } private List getTargetList ( ) { } private void connectBuildFileNameToTextField ( ) { } private void connectProjectNameToLabel ( ) { } private void connectTextFieldToBuildFileName ( ) { } private void executeTarget ( ) { } private void fillList ( ) { } private void handleException ( Throwable exception ) { } private void initConnections ( ) throws Exception { } private void initialize ( ) { } private void saveBuildInfo ( ) { } private class PrivateEventHandler implements ActionListener , ItemListener , TextListener , WindowListener , PropertyChangeListener { public void actionPerformed ( ActionEvent e ) { } public void itemStateChanged ( ItemEvent e ) { } public void propertyChange ( PropertyChangeEvent evt ) { } public void textValueChanged ( TextEvent e ) { } public void windowActivated ( WindowEvent e ) { } public void windowClosed ( WindowEvent e ) { } public void windowClosing ( WindowEvent e ) { } public void windowDeactivated ( WindowEvent e ) { } public void windowDeiconified ( WindowEvent e ) { } public void windowIconified ( WindowEvent e ) { } public void windowOpened ( WindowEvent e ) { } } private class VAJBuildLogger implements BuildListener { private long startTime = System . currentTimeMillis ( ) ; public VAJBuildLogger ( ) { } public void buildFinished ( BuildEvent event ) { } public void buildStarted ( BuildEvent event ) { } public void logException ( Throwable error ) { } public void messageLogged ( BuildEvent event ) { if ( ( event . getPriority ( ) ) <= ( getBuildInfo ( ) . getOutputMessageLevel ( ) ) ) { String msg = "" ; if ( ( event . getTask ( ) ) != null ) <START_BUG> msg = ( "[" + ( event . getTask ( ) . getTaskName ( ) ) ) + "]<seq2seq4repair_space>" ; <END_BUG> getMessageTextArea ( ) . append ( ( ( ( VAJAntToolGUI . lineSeparator ) + msg ) + ( event . getMessage ( ) ) ) ) ; } } public void targetFinished ( BuildEvent event ) { } public void targetStarted ( BuildEvent event ) { } public void taskFinished ( BuildEvent event ) { } public void taskStarted ( BuildEvent event ) { } } }

Fix:
msg = ( "[" + ( event . getTask ( ) . getName ( ) ) ) + "]<seq2seq4repair_space>" ;